Centipedes and Millipedes: Garden Allies or Occasional Pests?

Centipedes and millipedes are often confused, but they play very different roles in the garden. Both prefer moist environments and are mostly nocturnal, yet one is a predator and the other a decomposer. Understanding their habits helps you appreciate their benefits and manage rare overpopulations.

Key Differences

• Millipedes have cylindrical bodies, two pairs of legs per segment, and move slowly. They feed on decaying plant matter, recycling nutrients. In high numbers, they may nibble living roots, stems, or seedlings. Some secrete a mild irritant fluid.
• Centipedes are flattened, with one pair of legs per segment and long antennae. They are fast, venomous predators that hunt insects, spiders, and other small arthropods. Their bite is rarely significant to humans (like a mild bee sting).

Managing Millipedes

If millipedes become abundant enough to damage plants, reduce moisture: remove excess mulch, leaf litter, and debris where water collects. Improve drainage. Carbaryl-based baits can be used as a last resort, but drying the habitat usually solves the problem.

Centipedes: Welcome Hunters

Centipedes rarely need control. They consume many garden pests and pose no threat to plants. Simply reduce hiding spots (boards, stones, thick thatch) if they venture too close to living spaces. Their presence indicates a healthy, balanced soil food web.

Both creatures are far more valuable in the garden than in the house. A few individuals of each are a sign of a thriving, biodiverse ecosystem.